DERIVATIVES (INCOME STATEMENT CLASSIFICATION) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Sales Revenue Services Net	$ 453,081	$ 392,515	$ 885,294	$ 786,871
Other nonoperating income expense	(1,761)	1,865	1,635	2,663
Designated as Hedging Instruments [Member] \| Foreign Exchange [Member] \| Cash Flow [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in other comprehensive income (loss) - effective portion, net of tax:	58	(738)	168	(2,583)
Designated as Hedging Instruments [Member] \| Foreign Exchange [Member] \| Cash Flow [Member] \| Reclassification from accumulated other comprehensive income
Derivative Instruments, Gain (Loss) [Line Items]
Sales Revenue Services Net	79	(1,011)	230	(3,538)
Not Designated as Hedging Instruments [Member] \| Foreign Exchange [Member] \| Fair Value [Member] \| Reclassification from accumulated other comprehensive income
Derivative Instruments, Gain (Loss) [Line Items]
Other nonoperating income expense	$ (14)	$ (1,465)	$ (343)	$ (1,217)

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount of income (expense) related to nonoperating activities, classified as other.

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